The AKG DMS70 QR Vocal Set digital handheld wireless system is the first true uncompressed digital wireless system. It works in the 2.4 Ghz ISM band and is worldwide license free for every customer. The Bidirectional communication between the transmitters and receiver enables an intelligent system and leads to a dimension in ease of use. The AKG DSR70 is an up to 4 channel receiver and has the functionality of 4 channels mix down directly to the balanced XLR sum output.